A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 479
ELECTRICAL CURRENT MEASURE. [Exp. 79. = 1, we have C ^ I. The reduction factor of agalvanometer is therefore numerically equal to thecurrent which deflects it 45°; that is, the currentwhich produces a field of force at the centre of thecoil equal to the horizontal componeni of the earthsmagnetism.… … ElG. 225. Fig. 226. It consists of two parallel coils of wire wound.on brass or wooden rings a and h, with a surveying- iraoi.] COMPARISON OP GALVANOMETERS. 449 compass cd between them (see also Fig. 199, ^| 183).In the case of a single-ring galvanometer, it has beenstated that the length of the…
Physics
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